Quick answers
- Is CVE-2026-123279 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123279 being exploited in the wild.
- How severe is CVE-2026-123279?
- Critical severity, with a CVSS score of 9, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains Datalore before 2026.4.
- Is there a fix for CVE-2026-123279?
- Yes: fixed in Datalore 2026.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123279 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123279?
- Check whether you run Jetbrains Datalore at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Datalore 2026.4
Technical details
Datalore's access control mechanism failed to properly enforce read-only restrictions during notebook computation execution. View-only collaborators could inject and execute arbitrary code by manipulating computation requests. The vulnerability affects the core notebook execution engine and allows authenticated remote attackers to gain server-side code execution without needing edit permissions.
Affected products
- JetBrains Datalore before 2026.4
Timeline
- 2026-11-06: disclosed